State: New Mexico
Elevation: 6,611 feet
The Johnson mine was being prospected by the Socorro Mining & Milling Co. in 1916 but was idle in 1919. This mine is developed by two inclined shafts 400 and 450 feet deep and drifts at four levels, which have explored the vein for a total distance of 1,800 feet.
The principal vein strikes about west and dips 70°-80° N. The vein is narrower than the average of other veins in the vicinity and in few places exceeds 3 feet in width. West of the mine it is linked with a branch of the southward-dipping Fanney vein by a small vein that strikes about northwest and dips steeply to the southwest, and another rather obscure northerly vein joins the Johnson vein from the south a short distance farther west.
During a previous period of exploitation considerable stoping was done above an adit level east of the eastern shaft, possibly on ore at the intersection of the vein and the irregular mineralization that follows the small dike of rhyolite on the hanging-wall side. Recent work has disclosed small bodies of good ore as far as the 300-foot level, principally near the junction with the northwesterly vein referred to above. A small amount of exploration on the small northerly vein has revealed patches of copper sulphide are, oxidized in places, with a high tenor of silver. Other than this and the presence of a little unaltered pyrite, the ore is oxidized and resembles that of the Pacific mine. The quartz is of the common type, but in places fluorite is unusually abundant. Calcite is absent.
Outcrops of small and apparently discontinuous veins have been prospected here and there in the area between the Johnson vein and the Laclede Trail. A prospect 750 feet north of the Johnson mine shows a rather indefinite shear zone in which are quartz veins with considerable fluorite carrying a small showing of oxidized copper minerals.
Source: Geology and Ore Deposits of the Mogollon Mining District New Mexico. USGS Bulletin 787, 1927